Question

помогите решить уравнение.60+а=20.100- d=20+10.90-c=50.

Answer 1

60+а = 80а= 80- 60а= 20
100-д = 20+10100-д = 30д = 100 - 30д = 7090 -с = 50с= 90 - 50 с=40

Answer 2

60+а = 20
а = 20 - 60 = - 40

100 - d = 20 +10 = 30
100 - 30 = d
d = 70

90 - c = 50
90-50 = c
c = 40